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That is a really great post and it has made me clear on canonical tag. But i am still not clear on few things:

1. I have a site www.xyz.com and it has country specific domains www.uk.xyz.com and www.india.xyz.com. These sub domains have the same content as it is on the www.xyz.com

so as per my knowledge both sub domains are considered as separate domains to www.xyz.com. hence, it cant be content duplication, as for search engines it is 3 different domains. But I am not sure if search engine will take it as content duplication.

so if it is content duplication then how do i do rel canonical as my main page is on www.xyz.com and the duplicate pages are on www.uk.xyz.com and www.india.xyz.com.